WAZeigler

Hey, Recently I made a new skin online and uploaded it to minecraft(dot)net and then went to check it in vanilla minecraft. It worked. But for some reason when I went to check it in Tekkit classic, the icon at the lower right hand corner of the launcher still said I am using my old skin. Then when I entered the game it turns out the skin was not applied to the model correctly. I will be able to give screenshots if necessary. Is anybody else having this issue?