I am very upset as I have been collecting Disney snowglobes through the years. I notice each snowglobe has developed a large bubble on the top. I contacted somebody and they would repair for a large fee plus shipping. I thought the globes were airtight. To repair, they must break the glass, refill with liquid, then replace the glass. Do any others collecting snowglobes have this problem, too or is it just me? Should I leave them alone or get them repaired?