Be aware that the CO2e emissions shown in this app give an indication but have pretty big caveats:
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The CO2 emissions of nuclear that are shown are most likely too low. Electicity Maps just used the absolute lowest of a number of estimates.
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The emissions of hydro vary by climatic region but Electricity Maps uses a single standard value. Brazilian hydro is known to emit s lot of methane because of the hot climate and deep reservoirs which leads to anaerobic processes at the bottom of the reservoir. Some reservoirs emit more CO2e than an equivalent coal plant.
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They are showing solar/wind emitting emissions when they're producing electricity. However, solar and wind don't work that way because they're not using consumables. Their emissions mainly come from manufacturing and transport. In essence, solar and wind are emitting just as much whether they are producing electricity or not.