PROBLEM Glaze Firing Too Dark - Clay and Glaze Chemistry - Ceramic

Hello, it’s my first time posting on this forum. I‘ve only been doing pottery for 5 months. Recently, I fired a test pot I made using my Paragon test kiln and the glaze came out way too dark. The clay I used is Standard 240 white clay (cone 5/6). I applied underglaze to a small area before bisque

Does anyone know what causes the clay to be so dirty after glaze firing? The bowl turned out perfect, but the jug has dark spots all over (two different firings), also the

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