What's causing this weird sporadic blur? (Text rendered through VBO)

I literally just got my font/text rendering system to render text through a VBO, but I get this odd blur seemingly at random. It often obscures the text. What’s causing this? I’m using LWJGL 3, so if you ask for code be prepared to read Java.

My VBO is interleaved, following the format : { r1, g1, b1, tx1, ty1, x1, y1, z1, r2, g2, b2, tx2, ty2, x2, y2, z2, … } where ‘r, g, b’ are color codes (in floats), ‘tx, ty’ are texture coordinates (in floats), and ‘x, y, z’ are position vertices (in floats).

I have an imgur album with pictures but this site won’t let me post links and the upload manager says the screenshots are too big.

Please help me diagnose the issue. Thanks!