It's very much the broad tech sell off. Naturally APT, APX, NEA and WTC get hit hard whenever the index gets hurt in the US. I wouldn't worry about Nearmap as they have demonstrated fantastic return on capital long term.
There have been lots of gloomy articles like this as well: https://www.copyright link/markets/...-to-a-latestage-game-of-jenga-20181023-h170t3