If your toast is not toasting even, your toaster is in need of cleaning. Please see below cleaning steps:

After use and before cleaning, unplug the toaster power cord from the power outlet and wait for the toaster to cool.
  1. Wipe the outside of the toaster with a damp cloth and then dry it with another cloth or paper towel. Do not use abrasive cleaners; they will damage the toaster's finish.

    WARNING: Do not use any pointed or sharp articles for cleaning the inside of the toaster; this may damage the toaster.
  2. Lightly tap the side of the toaster to dislodge any crumbs caught in the toast chamber. Remove the crumb tray and empty it. Wipe the tray clean with a damp cloth or place it in the top rack of your dishwasher for cleaning. Be certain to put the crumb tray back into the toaster before using the toaster again.

    WARNING: Empty the crumb tray frequently. Crumbs will accumulate in the crumb tray and could catch fire if not emptied periodically. Wipe the non-stick surface on the top of the bread slots with a damp cloth and dry it with another cloth or paper towel.