Why is my Voice not recorded?

Why is my voice not being recorded in WhatsApp voice message as well as in normal calls my voice is not being heard..but in WhatsApp audio calls my voice is being heard...I tried recording my voice by turning on the safe mode (long press on power button) and it's perfectly alright...so what's the issue? Is it because of a third party app? I don't think so because I deleted all third party apps recently downloaded and checked for malicious softwares..but none are found...how can I solve this issue?