Animalperson100

I'm new to this forum but needed to post this somewhere because to be honest I'm really bamboozled right now. I got my first pet cockroaches about a year ago, two male Madagascar hissers. Last August or so one died, so I went online and ordered 5 more males to keep the survivor company. They sent me 4 males, a female, and a female dubia. I emailed the seller and they were honestly quite amazing, offered to let me ship any females I didn't want for free and send replacement males. Just wanting some pets and not a multiplying colony, I sent back the female hisser but kept the dubia thinking hissers and dubias won't breed. They sent two replacement males, leaving me with 7 males and a female dubia by September 1st. Fast forward to now, the second original male hisser also died but I still have the 6 new males and the dubia. The hissers bully each other sometimes but as a whole everyone gets along quite nicely. Yesterday I went to feed them and lo and behold, there's 15 or so little baby nymphs! I look at my dubia and she's still a little "open" (I don't know the correct terminology) so they were clearly hers. I isolated her and all the nymphs I could find but now I'm wondering... How?? I never hear of dubia/hisser hybrids but unless she had a 5 month gestation period and I aquired her pregnant... That's what I have. I still don't know what I'm going to do with them all because I still don't want an ever-multiplying colony but I'll figure something out because I must say the babies are so darn cute and I'm quite attached to the dubia. Thanks for reading, sorry this was long. Has anyone else had something similar happen?