The question was
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Do forward and back behave properly?
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The answer was
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forward and back are the same
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Since that doesn't answer the question, nobody can tell you whether you accidentally swapped the PWM channels, whether you need to invert the motor inputs on Open, or both.
There are four combinations, so you can try all four and see which works better, you can look carefully at the wiring and the code and make sure that the PWM are correct and try the combinations of invert, or you can describe the behaviors with more detail and someone can help you debug.
Either way, I'm sure you'll get it working quickly.
Greg McKaskle