Sure there is....if you keep slamming the door you'll be cracking the heck outta the sill. Fix it NOW, it's not hard.
Flush and clean the lock mechanics inside the door.
Then when that's done you can draw the doors in by simply adjusting the door post.
1. Compare the right and left door closing. Do both doors close into the tub so that the outside doorskin is flush with the tub. IF so, good. If not.. that's the starting point.
3. Does the door hang correctly on the hinges. The hinges can, and do move. Looking at the door closed tight agains the tub, does the front edge follow the line of the tub without touching, and is there equadistance between the tub on the leading and rear edges of the door? There should be. Now look at the bottom of the doorskin, is the gap equadistance beteen the doorskin and the tub? If not it should be.
Corrrect these problems before modification to the striker position.
Perform the Door Alingment Procedures
4.. Assuming the doorskin is flush now with the tub, then the only recorse is to move the striker. Compare the two stirkers, right and left sides. Are both stirkes at the same place on the tub verticlly and horizontally?
5. You can move OEM strikers easily:
a. Heat the stiker with a propane torch. This loosens the thread lock.
b. Using a small hammer, move the stirker to the desired location.
c. Let the stirker cool, an the threadlock will agian be enabled.
e. If you need to move the striker in or out in relationship to the tub door edge you can do so by heating and using a torex socket to spin the bolt adjuster.