Mangle and 1:1 NAT Problems

Hello,

I am new in this forum and in Router OS in general.
I tried to make some Load balancing with Mangle Prerouting Rules, which works perfectly, BUT, I have problems NAT-ing the private IP addresses to Public ones when I use Mangle Prerouting Rules. If i remove Mangle, NAT is working. I use 1:1 NAT for each private IP.

Any idea to use both MANGLE and Direct NAT at the same time?

Kind Regards,