Why are these lip gloss bottles not sealing/wiper staying in?

Sealing these tubes can be a learning experience. The lip gloss containers come from the factory with the wiper on the wand. We keep them on the wand when shipping for two reasons. First, so they don’t get lost in transit, and second, for simple and correct installation. When the wiper is up in the cap you can insert the wand into the tube, apply a bit of pressure, and tightly screw the cap onto the bottle. In doing so you will be threading the wiper into the inside of the tube to ensure it stays in. Once you have it tight and the cap is screwed on, you can unscrew the cap and the wiper should be snugly installed into the bottle. We recommend filling the bottle with your formula prior to installing the wiper.