You’re talking about in a trap, right?
If you look closely, it is a “dual orange-red”, but you’re not getting multi-hit.
The reason is simple – before a gem will hit more than one target in a trap, the splash radius needs to be 15 or greater. You can’t see the splash radius while it’s in a trap, only tower or inventory. If it’s in a trap and you keep adding red gems to it, then (for example) it will go 8>9.8>10.9>12.3>14.1>15.6 and bam you get multi-hit.
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