Moving Issue on Minecraft: Bedrock Edition (iPad)

The strafe right button is not working on Minecraft. I tap it and hold it down then it would start breaking a block. The forward, left and backwards buttons work just fine, but the button to strafe right on Minecraft Touchscreen is not working. Please fix this if you can. It's kind of annoying and I like using those buttons to help me move around in my Minecraft world.