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Canopy Growth is the derecognition of the ISIN change. There was no price for a derecognition, so getquin takes €0.

It will probably be the case with most of these transactions that they were either portfolio transfers or ISIN switches.

Regarding the price data:
getquin does not know what your broker does not offer for trading.
Therefore, the prices from an exchange show where the thing is tradable. (getquin does not know which stock exchanges are available in your country, but has more or less global price data, which is why some Russian shares also have price updates here, because they are tradable in Moscow).
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@Staatsmann Thank you! It has really shed some light on things for me