Hi!
ever run into this problem
Yep. The reason is simple: you have too many production buildings and too few econ ones to sustain 100% production output. Unfortunately the solution is not so simple. Increasing econ output takes time and money. Time to grow more pop (to make more taxes), and money to build more econ structures (markets, a farm or two, one or two morale ones). Until then you can cover some of those expenses by selling unimportant tech, or just decrease research funding.
BR, Iztok