Curdled frosting issue. Help PLEASE

I feel very frustrated today. I made 4 different buttercreams and all of them ended up curdled. I have no clue what went wrong or what I did.

First buttercream was for Lime Strawberry Cupcakes - mixture of butter, cream cheese, strawberry puree and lemon juice.  All room temperature, strawberry added tbs after tbs. Curled .

Other was Dulce de Leche with butter - same effect.

Next - buttercream with strawberry puree only. Curled.

Last one was for Neapolitan Cupcake. Regular buttercream with cream cheese and little amount of vanilla ice cream. Curled again.

I tried to beat it on high, add little of butter, melted it in microwave. Disaster.

I never had this issues before, at leas not this amount.

I used same Brand ingredients as I did before. This recipes were new to me though and also, I used my  new Kitchen Aid. I was using just regular stand up mixer before. Could all this happened because of over beating? Or what else can be problem? Please, any advice will be appreciated.