Help I unlocked monsterwood previously but when I opened the app, it disappeared! Please someone find me a solution.

Is it a glitch or something?

How long have you been playing Monster Legends? If you're a new player, it could mean that it was unlocked early for you

I just started playing about 2 weeks ago

So that could mean that it showed up earlier than it should have. Players generally get Monsterwood after around 20 days of playing so if it still doesn't appear after another week or so, you should contact support