Users report over 15% error rates with Koinly's cross-chain transaction aggregation, sparking widespread complaints. Issues include miscalculated profits and losses, especially with liquidity pools and bridging, where Koinly often treats transactions as swaps. On platforms like Reddit and Koinly’s forums, users highlight problems such as incomplete transaction histories, missing price data, and incorrect capital gain calculations. For instance, one user noted discrepancies after clearing Koinly’s cache, resulting in altered report figures. Others point to challenges with private sales or API import errors, requiring manual data entry. Koinly’s support suggests verifying transaction histories and adjusting settings, but many users remain frustrated, seeking alternatives for accurate crypto tax reporting. Better cross-chain tracking and improved API reliability could address these concerns.