Deductions & credits

Box 10 in my W-2 indicates $5000 but that was money I elected to take out of my paycheck and put into a dependent care FSA throughout the year; it was not additional dependent care support from my employer. 

 

I'm confused as to why my dependent care tax credit is reduced/eliminated because I put money in an FSA. 

 

1)  Should I check with my employer as to whether it's an error on my W2? and 

2) If it's not an error, and contributing to a dependent care FSA reduces/eliminates my dependent care tax credit, is it better to not have a dependent care FSA?