Bug with lvl 5 traits on a legendary survivor?

in Bug Reports
So I just noticed that my lengendary hunter's 1st skill is a lvl 5 marksman and when I mouse over it, it says +12%. My epic hunter has a lvl 4 marksman and it also shows +12%. Per a web search a lvl 5 should be 15%
Is there a glitch with legendary heroes that were acquired in March 2016?
Is there a glitch with legendary heroes that were acquired in March 2016?
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Also, assuming 2 legendary hunters, with the same traits... if one has level 4 marksman and one has lvl 5 marksman, would that % show in the damage when you equip them with a weapon?
In other words, I wanted to check to see if the lvl 5 marksman was actually lvl 5 but showing 12% in error... so I put the same weapon in both and sure enough the damage was the same even though 1 has lvl 5 marksman and the other lvl 4.
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@zbot
I haven't played since about March 2016... and started up again a couple weeks ago. All level 5 traits show the lvl 4 value as far as I can tell...
As you can see, Bob has a lvl 5 marksman, but shows 12% and Alice has a lvl 4 and also 12% and both have the same weapon and do the same damage.