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A SCTR.large are stocks that are or were once in the SP500. The stock may belong elsewhere in real life, but that is how StockCharts has decided to classify stocks.
Some stocks, like M (Macy's), are current members of the SP SmallCap 600 but were once members of the SP500 and are therefore and forever, classified as LARGE. JWN (Nordstrom) with a similar market cap to M, is a member of the SP MidCap 400 but listed as LARGE for SCTR purposes.
Just something to keep in mind if you use SCTR size declarations for scanning.