The 'Problematic Paper Screener' (PPS, WCRI'22, https://doi.org/10.48550/arXiv.2210.04895) flagged 12k+ questionable articles featuring tortured phrases, such as 'glucose bigotry' instead of 'glucose intolerance.' It daily screens the literature for 'fingerprints' from a list of 4k tortured phrases known to reflect nonsensical paraphrasing with synonyms. We identified a concentration of 'tortured articles' in IEEE conferences and reported our concerns in November 2022 (https://retractionwatch.com/?p=127299). This WCRI submission unveils 'tortured conference series': questionable articles that keep being accepted in successive conference editions.