metal rings will basically always "raise" tho they do no such thing..........as the wood gets older it loses more moisture and becomes denser to a degree.........wood moves as we all know, METAL DOES NOT expand and contract nearly enough to be the cause.
But theres more than just that. The rings could also not be concentric to the center to the cue as would be the case if the tennon were cut too small the rings would then have lateral play with only glue/epoxy to secure the bond..........that bond can shift over time and the rings will feel higher than the cue surface but usually in this instance its more pronounced on one side of the cue and not on the other.
Joint connections of steel, phenolic and the like can also seem to be raised over time for the same reason the wood contracts a few thousands..............OVER TIME
One "fix" for raised rings is to undercut the rings leaving them a hair below the top surface of the wood and then applying the finish. Another trick is to use a phenolic sleeve under the rings on the tennon, and lastly you can finish the cue and wait 4-6 months and sand the finish down and add a few more coats.
The raised berm is why makers like Southwest and DPK don't use plastic or metal rings in their cues, only wood.
IMOP tho if you have had the cue for just 3 months and the joint collars are showing very noticible O.D. differences compared to the wood then I would go out on a limb to say that the wood in the cue was not properly seasoned prior to construction.
Like eventually most of those cues will one day develop an actual crack in the finish in the area of the raised berm.........but that takes basically at least a few decades on good equipment that was properly seasoned...........hell you see it alot with old cues that are jam up but the ferrulle is very loose.....the tennon shrunk over time in diameter and it eventually broke the glue bond on the compression fit.
So a slight raising of the ring is acutally very common with in the first year, but finish degredation in the form of a crack or something should take forever and then some to take hold. The collars are another story as there isn't much wood to shrink in the joint with a collar and a pin inserted...........I can't even remember the last cue that I owned that the collars were like that unless if it were just another ring set issue.
I'd talk to the maker and tell him your issues first off.
-Grey Ghost-