[Solved] ESP8266 - writing data to EEPROM and reading gives different data.

D1 mini PRO. I used the example. I did a bit of reading on how it works and wrote a dozen boolean and byte variables to the EEPROM. Writing and reading was correct. I tested for 2 days. I decided that everything was working correctly. I wrote mainly the byte variables with a value of 100.
I set the EEPROM size to 512 and increased the usage to 380. This I did at home.
At work I checked and corrected the code a dozen times also resetting the board. I saved some space in the eeprom with a variable byte of value 99. Everything wrote and read correctly.
At home I connected the board to the PC, fired up the Arduino IDE, did a readout and all the values I had at work saved as 99 read as 100.
What is it, I thought? I ran a piece of code writing the EEPROM with a byte count of 99. Each time the readout gave 100. I changed the value being written to 0. Also 100. Finally, I did the write three times without doing the readout. After the third time, all the fields that were supposed to be zeros turned out to be numbers 99.
Well... if the EEPROM.commit() was missing I would still understand, but this action of the eeprom completely deprives me of the possibility of a logical explanation.

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Above are snippets of code to enable the relay. I am operating on time, so the numbers 99 indicate empty eeprom cells.
Below is a function that should produce 0, and the numbers 99 appear.

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So what can you make of this?

sotb wrote:

I set the EEPROM size to 512 and increased the usage to 380.

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Show what this initialisation of the emulated EEPROM looks like in setup(), in particular this "increase".

Ordinary.
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When testing the initial code I used 319 bytes. Currently 382.
That's all the code when it comes to assigning values to variables.
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And below is the save function in its entirety.
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What board settings do you have in the Arduino IDE in both cases? 16M (14M SPIFFS) or 16M (15M SPIFFS)?
I assume that "LOLIN (WEMOS) D1 mini Pro" is selected.

I didn't even notice that at work I have LOLIN(WEMOS) D1 R2 &mini - 4M(no Spiffs). At home Lolin(Wemos) D1 mini PRO - 16M(14M SPIFFS). Could this be the cause?

sotb wrote:

Could this be the cause?

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Maybe. This is relevant when linking code for ESP.
The EEPROM class documentation for the ESP8266 says " EEPROM library uses one sector of flash located just after the SPIFF S".
I wonder if, if you compiled and uploaded the code in "4M(no SPIFFS)" mode, this library will work correctly.
It wouldn't hurt to compile and upload the code again, but with the board settings "Lolin (Wemos) D1 mini PRO - 16M(14M SPIFFS)" and check.

Indeed. After changing the settings at work to the correct board these surprising problems do not occur, so thank you for the tip. I click "helped" and close the topic.