Runny poo

TMI

My 10 week old girl has been having runny poos lately and goes every 1-2 times a day when she used to go every 2nd day however her poo was soft/mushy. She is feeding normally and just recently she has been leaving a little bit of milk after her bottle (she usually finishes it all) but still drinks plenty. She is having plenty of wet nappies and only has 1-2 dirty ones so she isn’t going through lots of dirty ones. She has had her 8 week jags the other week but was still having runny poos before then and I thought it was because if I was giving her pre made formula as I ran out of her powdered milk, is this normal?? She seems fine in her self still.. I dunno if she is teething or not as she is putting her hands in her mouth (sucking her fingers), making bubbles..

At her 2 month check up they checked everything and they said everything is fine??

I’m just more concerned that her poos used to be formed but now they are runny.