The Line Graph shows inaccurate timestamps or values. Timestamps may be off by some seconds, minutes, or hours, and values may also be inaccurate.

For example, the temperature peak in the below graph shows value 45,40 °C at 04:05:48.

... but when zoomed in it shows a different timestamp and a different value.

The Line Graph does not show raw data. It shows aggregated data.

Only a limited number of data points can be displayed on a computer screen. To achieve this, the displayed time period is divided into smaller invisible periods, called "buckets", and per bucket a single data point is displayed. The aggregator configured in the Line Graph component is used to determine which data point is displayed. If the aggregator LAST is used and two or more values happen to fall into the same "bucket", only the last value will be displayed.

There is no solution to the inaccuracies, because that's simply how data aggregation works. However, depending on your precise use case it may be possible to improve the data visualization so you can get the information out of it that you need.

Choose an aggregator in the Line Graph settings that best suit your use case. If high points (peaks) are important to you, changing the Aggregator to MAX will improve the data visualization for you. On the other hand, if low points (valleys) are important to you, you'd want to go with aggregator MIN instead. If both are important to you, keep in mind that you can add the same tag to the Line Graph twice, once with aggregator MAX and once with MIN. Have a look at the aggregators in the Data component options in the article Create, edit, and use Device pages to see which aggregators may be most relevant to you.

Below is the result of applying the aggregator MAX to the example in the beginning of this article. Note that all peaks are now more clearly and accurately visible.