It’s usual that the secondary listings have small trading volume. For example, European & Canadian listed stocks with a secondary listing in US OTC. Or US Stocks listed also in European stock exchanges (including EDRs, GDRs).
Normally the secondary listings are less liquid due to small trading volumes, making it difficult to buy or sell. Especially selling during sell-offs periods. Also stocks with less liquidity, have larger bid-ask spreads. Any unusual trading volume will cause higher volatility, provoking higher bid-ask spreads.
Not always good to buy secondary listings due to those. When possible it’s always better to go to the primary original listing.