It's possible you installed the valve upside down, all values should be labeled in some way marking either hot and cold or it will say the word up where the riser tube port for the shower head is. If that's not the case remove the tub spout and check for any obstruction sometimes during tile or constructing debris can get into the pipe for your tub spout. Lastly the diverter on the tub spout could be bad. Try a new tub spout
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