this is the AAPL optionchain data, I got from backtest.the time in slice is 20230704,AAPL close price is 192.4.optionchain's expiry is 20230707.in this data, delta = 0.3 option contract strike = 175.The strike price of the option is $20 away from the stock price.

i get some data from my brokers.you can see AAPL price at $193 now. delta =0.3 option contract strike between $192.5 and $190. The gap is only a few dollars.
backtest data:

TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00149000,Strike:149.0,Expiry:2023-07-07 00:00:00,ASK:0.01,BID:0.01,Delta:-0.236478804261922
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00150000,Strike:150.0,Expiry:2023-07-07 00:00:00,ASK:0.01,BID:0.01,Delta:-0.239559598372378
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00155000,Strike:155.0,Expiry:2023-07-07 00:00:00,ASK:0.01,BID:0.01,Delta:-0.255162110087234
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00157500,Strike:157.5,Expiry:2023-07-07 00:00:00,ASK:0.01,BID:0.01,Delta:-0.263097663700724
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00160000,Strike:160.0,Expiry:2023-07-07 00:00:00,ASK:0.01,BID:0.01,Delta:-0.271134462146621
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00162500,Strike:162.5,Expiry:2023-07-07 00:00:00,ASK:0.01,BID:0.01,Delta:-0.279283726129787
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00165000,Strike:165.0,Expiry:2023-07-07 00:00:00,ASK:0.02,BID:0.01,Delta:-0.288489067819784
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00167500,Strike:167.5,Expiry:2023-07-07 00:00:00,ASK:0.02,BID:0.01,Delta:-0.297221259150151
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00170000,Strike:170.0,Expiry:2023-07-07 00:00:00,ASK:0.03,BID:0.02,Delta:-0.307713950871447
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00172500,Strike:172.5,Expiry:2023-07-07 00:00:00,ASK:0.04,BID:0.03,Delta:-0.318382991974949
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00175000,Strike:175.0,Expiry:2023-07-07 00:00:00,ASK:0.04,BID:0.03,Delta:-0.328631358062776
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00177500,Strike:177.5,Expiry:2023-07-07 00:00:00,ASK:0.05,BID:0.04,Delta:-0.340465486635744
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00180000,Strike:180.0,Expiry:2023-07-07 00:00:00,ASK:0.06,BID:0.05,Delta:-0.353065225818468
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00182500,Strike:182.5,Expiry:2023-07-07 00:00:00,ASK:0.07,BID:0.06,Delta:-0.366730092849534
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00185000,Strike:185.0,Expiry:2023-07-07 00:00:00,ASK:0.09,BID:0.08,Delta:-0.38287388205752
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00187500,Strike:187.5,Expiry:2023-07-07 00:00:00,ASK:0.16,BID:0.15,Delta:-0.404782075889471
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00190000,Strike:190.0,Expiry:2023-07-07 00:00:00,ASK:0.45,BID:0.44,Delta:-0.435523303326642
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00192500,Strike:192.5,Expiry:2023-07-07 00:00:00,ASK:1.28,BID:1.26,Delta:-0.471817280492187
TIME:2023-07-04 00:00:00,AAPL:192.4,Option:AAPL 230707P00195000,Strike:195.0,Expiry:2023-07-07 00:00:00,ASK:2.9,BID:2.85,Delta:-0.510988013737577

broker's data:

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