I keep getting that problem too... There must be a design issue on the mobile app (Android for me) where links in comments near the top of the page don't work, but links further down the page do work. Maybe there's a screen-sized swipe-gesture detecting mask that prevents other taps from working.... Note to self: report this somewhere more appropriate.. :P
The "h" in roimh isn't a "real" letter - it's called a séimhiú and it's only purpose is to modify the way preceding consonant is pronounced (until the early 20th century, the séimhiú was indicated by placing a dot, or buailte above the consonant - the use of an "h" instead became widespread with the introduction of typewriters). In roimh, the modified m has a "v" sound.
That's not true of the p in roimpi - it's a real letter, and it doesn't change the pronunciation of the m, so roimpi is pronounced rimpee, with both the m and the p pronounced. (I would render the Ulster promunciation of roimh as "riv" rather than "ruv" - if you hear "ruv", then you'll hear "rumpee").