It could also mean short positions were increased
Post# of 72440
"In this case you only want 10,000 shares, so immediately the MM sells your broker 10,000 shares short and marks the trade as “short” although you are long in the trade, this gets reported to the Daily Reg SHO report and also on the consolidated tape."
https://investorshangout.com/post/view?id=4816479
"So, this is why the short sale volume is high but also why the FTD’s and bi-Monthly short interest reports are not showing any indications of this volume. The short isn’t really a short it is the execution of a long sale by a market maker."
https://investorshangout.com/post/view?id=4670279
That's why I made a suggestion to add an explanation to avoid misunderstanding and thank you for forwarding my PM.