Numbers on the far left are misleading as Die Linke is bleeding members to the BSW but the BSW is taking their sweet time handing out membership cards, double-checking every single applicant. Reportedly they have a backlog of at least 8000 applicants or such and at least 20k people generally interested. Wagenknecht is at least 70% tankie so it doesn't surprise that they're doing a vanguard thing.