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It's multiplicative, not additive. It's always been that way. The wording's actually correct. "Increases by 10%" does not mean +10% only. 22% is 20% increased by 10% as well. Just look at the percent change formula.
Percent change = [(V1 - V0) / V0] x 100
= [(22 - 20) / 20] x 100
= (2 / 20) x 100
= 0.1 x 100
= 10% increase
=> increased by 10%
If you need confirmation that it is indeed multiplicative, that was on old forums as well as EU forums.
NA announcement description: "Increases the probability of a successful Enhancement by 10% of the current success rate
For example, if odds of success are 50%, using a Goibhniu's Enhancement Stone will increase the odds to 55%" http://vindictus.nexon.net/news/10932/urban-punk-and-angel-sets
There were others, but I'm not going to look for them.
**** I clicked check for updates to see if I was already on it, and it's automatically installing the Fall Creator Update.
Make sure you submit a ticket, so they're aware of the issue. Include a link to the thread as well.