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If you have a leak from the front then you probably have a defective cartridge in the valve. It shouldn't pull in and out. Sounds like you also have the wrong cartridge in the valve. Specs specifically state the 1225 cartridge (the one for a mixing valve) is not a suitable substitute.
The cartridges are very similar and also install in the same way but the cartridge for this transfer valve should not have a stem that pulls out like on a mixing valve.
T4311 is a trim model number. It's not the number for the valve itself. The compatible valve for this trim is the 3372. I see no mention of pulling the stem out in the instructions for the 3372. In any event if it's leaking behind the handle the cartridge is defective. The proper replacement cartridge for the 3372 transfer valve is 116719. If this is a brand new valve you should get a free replacement from Moen under the warranty. You can call them at 1-***-***-****
Of course another possible maybe be that you don't have a transfer valve roughed in the wall.
How am I incorrect?! What you said is exactly what I said the problem and the fix was! I said you had a bad cartridge and the correct cartridge was the 116719
Direct quote from previous answer "In any event if it's leaking behind the handle the cartridge is defective. The proper replacement cartridge for the 3372 transfer valve is 116719."