i am sorry that you wasted your time growing a pepper you wanted to be a Reaper that is clearly not a reaper at all.
i hope in the future you will look toward the vendor vault here for reputable seed sales vendors
alternatively join a seed train here, or find other members to do seed trades with.
The good news is, you may have still grown tasty peppers however they are most certainly not reaper.
When growing new to me peppers, unexpected hybrids, etc.
I generally like to try them in multiple ripeness stages from; green all the way up till overripe and almost gonna go bad.
can generally get an idea how to use them best this way, also learn how long they keep after picking .
I think it's anyone's guess as to what pepper or hybrid you got.
Attempting to even 'name' it as a guess, could continue to lead to misinformation.
IMO, best to accept that; it is clearly 'not a reaper', and just enjoy the fruits of your labor, and try again next season.