Is any part of the motherboard suposed to be magnetic?

Hello Ifixit

I have my iphone 6 since september last year , i had small issues with losing network from the begining but after a while everytime my phone turned off i strugled a few days (turning my phone on and off) until i would get network again, until i gave up and have a phone i can use only with wi-fi, i also noticed that when i open maps my cursor seems to spin in place , so i decided to open my ohone up using your guides and noticed that 2 part on my phone were magnetic , the first one being the part that does the vibration but also the lower part of my motherboard ,after the reasembly i probably did something wrong which lead to the phone showing that my earphones are connected at all times , coming to my question . Is any part of the phone interior suposed to be magnetic and would that lead to the problems i am having with my phone

Waiting for a response