Two representative examples of problematic photometry identified in SED builder data during our catalog cross-checks and visual inspection. Top: The position of PKS 2149−306 is marked with an open x sign, a catalog cross-match with SED builder tool yields a mix of photometric data from the correct counterpart but also from the nearby bright object marked with a magenta circle, which was misidentified as the optical counterpart in the Haakonsen & Rutledge (2009) catalog. Bottom: Same plot for PKS 0519+01. Contamination from a nearby source is visible in the WISE band when large-aperture photometry is used. The SED builder tool by default returns fluxes from three different extraction methods without a clear distinction. In both examples as well as in all cases with similar issues, the problematic photometric measurements were excluded from the SEDs used in the analysis.