Look straight down on the edge and angle the blade back and forth looking at the edge.
Any shiny reflections are chips or rolled.
Depending on what you see, will determine what needs to be done, but sounds like at least a touch up with a finish stone.
Too much pressure, while stropping will easily roll or chip an edge.
Diamond are notorious for harsh edges, they will cut hair, but shave like a hacksaw if used with too much pressure.
Here is what you are looking for, the shiny spots are micro chips or rolled edge.
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