I went out to our warehouse to see if all of our Taylor Made Marine Gas Strut for Boat Hatches # 3691837 were compressed like you mention yours is, and they are not. My thoughts are you may have a faulty strut, these struts should be extended and require 40lbs of force to compress.
In some cases you may be able to twist the shaft of strut counter clockwise and that may release the strut if it is stuck closed. view full answer...
Assuming you got the correct strut from Amazon if you have the # LC280343 on your RV currently this should be the correct replacement. There isn't an easy way to install these wrong as well so it's also possible the ones you got are bad. Older shocks needed to be pumped a couple times before you'd install them so you might try that and see if the pressure changes. view full answer...