Check the descriptions that you have entered for the products in PTSC. This issue normally occurs when there is a space between the feature text and separator (i.e :),
For Example in the case of Burstable : 1 GB, the tooltip would not work. because there is the space between the text (Buirstable) and separator (:), To resolve this issue you should remove this space. Now the description should be like this Burstable: 1 GB