Most likely, there’s some CSS somewhere that is accidentally selecting those controls and hiding them. You can check this out by using Chrome’s inspector (or the equivalent in other browsers) to look at the page code right where the buttons are supposed to be. If you see the form and input tags, then Seamless Donations is presenting the controls. Somewhere else in your CSS, something may be processing a display:none or other tag that’s accidentally grabbing onto your donation controls.