tqsdk下载过去的上证50etf期权数据的时候，为啥2018年的很多合约的行权价价格看起来很奇怪吗？

strike price: 2.553, symbol: SSE.10000969
strike price: 2.602, symbol: SSE.10000970
strike price: 2.651, symbol: SSE.10000971
strike price: 2.7, symbol: SSE.10000972
strike price: 2.749, symbol: SSE.10000973
strike price: 2.553, symbol: SSE.10000974
strike price: 2.602, symbol: SSE.10000975
strike price: 2.651, symbol: SSE.10000976
strike price: 2.7, symbol: SSE.10000977
strike price: 2.749, symbol: SSE.10000978
strike price: 2.798, symbol: SSE.10000985
strike price: 2.798, symbol: SSE.10000986
strike price: 2.504, symbol: SSE.10000987
strike price: 2.504, symbol: SSE.10000988
strike price: 2.455, symbol: SSE.10000989
strike price: 2.455, symbol: SSE.10000990
strike price: 2.847, symbol: SSE.10001009
strike price: 2.847, symbol: SSE.10001010
strike price: 2.651, symbol: SSE.10001025

使用的api是：

1. 1. tq_symbols = api.query_options(“SSE.510050”)， 拿到所有上证50etf的期权合约名称
      2. info = api.query_symbol_info(symbol), 拿到每个合约信息，去除strike_price

这里的行权价格区间很不均匀