Has anyone dealt with this with their kids?

I have an 8 year old and twin 2 year olds. Whenever my 8 year old would get the flu (he hasn’t in a while so idk if it would happen still) he would get a high fever and once I would give him medicine and he would break that fever his body would go from 103-104 F to 95-96 F and then be normal. I would talk to his doctor and take him to the er for low body temp and they would say he is normal or that they’ve never dealt with this.

Last night my husband brought my 2 year old (L) to bed with us and was trying to get his temp and it was 96 F after being 103.3 earlier in the day. He has had the flu all week. He ended up warming up. The difference is that L was in the Nicu for not being able to maintain body temp and was at 91 in the ER at 4 days old. So it really worries me even though he can regulate his temp better of course now that he’s older. But curious if others have ever dealt with this and I’m not crazy?!