Merge icons have inverted meaning
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The merge left and right icons are drawn from the perspective of traffic that has the right of way, as opposed to the user who has to merge:
Seen another way, the icons are rotated to match the bearing after the merge rather than the bearing before the turn, which is inconsistent with ordinary left and right turn icons. This inconsistency is especially disorienting when paired with a map that automatically rotates to match the user's bearing or course.
By comparison, the standard glyph in North America depicting an upcoming merge onto another road is optimized for the user's bearing before the merge:
You don't see this sign often in the United States because the merge is usually posted with a single sign in the median.
The current icon looks much more similar to the standard sign posted in the median between two merging roads, intended to inform the traffic that has the right of way that a road is merging into the current road: https://commons.wikimedia.org/wiki/File:MUTCD_W4-1R.svg