During SHB they changed the way Collectables work.

The old way with Collectable toggle is no longer a thing except for FSH. For MIN/BTN, every item is now either ONLY normal or ONLY collectable (as noted by the collectable symbol on the node list), the latter automatically bringing up the new collectables gathering window when you attempt to gather it. Similarly for crafters you no longer craft collectable versions of regular items, but rather dedicated collectable-only items.

The nodes themselves do not appear any different on the map, and Lay of the Land does not differentiate when guiding you to the nearest one, either, so if you are near a cluster of collectable-only nodes that's where it will point you. Can be a bit obnoxious if you're looking for the regular version, I'll admit (much like the first rollout of Ishgard Skybuilders materials in ShB, prior to the rerelease of Diadem they were scattered around the zones in similarly dedicated nodes).

It's not uncommon for the Miner and Botanist node layouts in an area to be very disparate, so it's also rather uncommon that you'll find the collectable nodes for both in the same part of a zone. I'm guessing you moved around before switching back to MIN? So you probably were in an area with collectable mining nodes, switched to BTN, found normal trees (possibly having to move around to get to them), then switched back to MIN and were in an area with regular item nodes.