Small Problem using Excel

I use excel to create reports, tables, score sheets, etc. and recently it has began to foul up. My reports always end with the "E" column. Normally, when I move from a cell to the next cell on the right I use the Tab key, but now the Tab key sends me to the G column, same row! I have tried Office repair but no luck, am using the right arrow to get there, except when by habit I hit the bloomin' Tab key. OK, I know I probably have something set up incorrectly, just tell me where I made the mistake and how to correct it so I can get back to my normal habits. Thanks Woody