I mean r3 level 5. Because smash shows as a capped 20 reforge in the table, so the maximum ought to be 5, not 3...have yet to see any smash 4 or so though. Same with pally duration, I had dura 2 once, but I think it's capped there, not at 5 either.
The higher levels of any rank are always impossibly rare.
It's that way so that when you're stuck at r3, only 1~2 (and 3~5 for very few reforges) is practically attainable. The same applies to r1, actually getting a Lv 20 is very, very, very rare even if you are on that rank.
It's not limited to just the reforges you mentioned, but most of them. If you think about it... save for melee weapons reforges, some new fighter/gold strike reforges or very rare items with rank 2 reforge... when was the last time you saw anything with a reforge higher than Lv 2? Even if the max possible for most reforges is 20 and at least 5 at rank 3.