I'm a bit confused here. I recently put an older pair of roundwounds back on my bass, and.. they actually sound brighter than before.

Is this normal? I thought that once strings get worn they become 'dead' sounding, not brighter! It's very very edgy now.
Maybe it's because I haven't heard it in a while? I've been using rotosound trubass 88s for maybe a week and a half and put these back on for the time being (they just weren't loud enough and a bit too 'thumpy', next time im going for TI jazz flats

)