Danco Faucet Stem  "installed reversing valve backward" Questions

valve for your shower control or it is installed backwards. Sometimes the valve can be installed at either 180 degree angles. See if it can be installed any other way. If so this may solve the problem

installed as per the directions. Upon testing the unit, there is very little flow with hardly any water pressure. With cartridge out, water pressure significant to reach the back end of the tub. Is it