when i host a game and i choose scenario only one shows i had loads the other day is this a bug or something since voobly mods shows them all

What data mod are you using?

Most likely you changed the mod...

i have changed it to 1.5 and only one scenario shows they show on 1.6 custom scenario and 1.6 data game but not 1.5 strange

i have copied all scenarios from 1.6 to 1.5 so it should work

That's exactly what you shouldn't be doing. We already included all scenarios compatible with 1.6 Custom Scenario or 1.6 Game Data.

what if people want to play 1.5 instead

1.5 or 1.5 AND 1.5 Game Data AND 1.6 + 1.6 Game Data are using their own directories for scenarios. For 1.5 we have a map pack that comes with all the maps and keeps them up to date, as well as 1.6.

For 1.5 you use this one:
https://www.voobly.com/gamemods/mod/46/AoC-Custom-Scenarios

For 1.6 the maps are already included with the data mod.

well in voobly mods file i only have 1.6 custom scernario and and 1.6 game data but no 1.5 stuff

If you play 1.5 with any mods, then you play the original AOK/AOC. When selecting 1.5 + 1.5 Game Data, you'll be playing AoE II HD and when you select 1.6 + 1.6 Game Data you'll be playing DE. Depending on your game room settings, you'll automatically see all the maps that are available for the selected patch.