Playing back recorded sound is tinny and echoy

Posted in this section as I couldn't find anything more relevant.

When I record anything from YouTube etc it sounds perfect whilst recording. However, when I play it back it is very "tinny" and "echoy".

I've played it back through various software (ITunes, Movavi Media Player, Audacity) and they all sound the same.

It was some time ago I last did something like this and didn't have a problem.

I can't see it being the speakers as just playing audio is perfect, it's only playing back recorded items.

Any help would be much appreciated.

Ken