Unhappy gum tree

I planted a dwarf lemon scented gum last weekend and I’ve noticed a change in the leaves.

When I bought it from the nursery, there were spots on the leaves, though they said it was normal for a gum tree. The spots weren’t all over and were nothing like how it is now.

I’ve checked the soil and it’s not dry (nor very wet).

Has anyone come across this or knows what steps I should take next?