Not much to go on … but I’ll take a guess.
Are you using FBA and the inventory has not been received by Amazon yet ? Because until it is received it’ll show as ‘0’
If you are FBM (Merchant Fulfilled) Did you enter a quantity ? If you did how long since the upload ? Amazon process each section of the template - Product Data, Price, Quantities,
Images, Etc. individually. Sometimes the file hangs and only part gets done for a while.