-
Maybe they are sharp? Did you put your tuner on to see the degree of sharpness?
All things equal they should sound the same as your old strings assuming your attack has not changed either. But then again "should and equal" are not what you have going on right?
The suggestions that the strings may be different guage are valid. Strings with different gauge have different tension. This could lead to variation in your attack. I put in a link to youtube that is great to see what happens to strings as they are activated. Depending on how you attack the strings they do differnent things. The more precise your attack is,.. the less distortion your string will make.(The more they vibrate parallel to the fretboard verses perpendicular, including going round and round.) Not saying that is the issue but it may be part of it.
I like @Bill_Brown ‘s research result and I would go as far as recomending putting those strings on your guitar and then work on you attack: meaning, can you find a way that does not induce the sound you don’t like…? That is the low cost way. If after that you still have issue take it in to a luthier show what the problem is and see what can be done.